mostly on computers and mathematics
foldl: (x * y) * z
foldr: x * (y * z)
Also a nice reference: https://wiki.haskell.org/Foldr_Foldl_Foldl'
See also these nice pages: foldl.com, foldr.com
That reference is one of the best things I have ever read on Haskell! Thanks so much for linking to it!
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